MySql >= 4.1 Client does not support authentication protocol...

December 2, 2004
If you upgrade your MySql server to >= 4.1 you might get the following error:
Client does not support authentication protocol requested by server; consider upgrading MySQL client

This happens because the latest versions of MySql uses a new format for the password (it's a longer hash). In order for old clients to continue to use the newer server, you have to set the passwords on the server to their old format or upgrade your client. Because upgrading the client can sometimes be a pain, it's often easier to just update the passwords to the old format on the server.Run mysql and login as root:
mysql -u root -p
Then, paste the following command, editing as necessary, to change the password of the user to the old format.
SET password=OLD_PASSWORD('somepassword')
WHERE USER='someuser'
AND host='somehost';
After you have set the passwords to the old format, flush the tables.
FLUSH privileges;

Then exit the mysql client with "quit" and you are set.

See for more technical information on this issue.

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Comment December 30, 2004 by Harry Litzroth
Wonderfull. This article solved a problem I had in a clear and concise manner. Thank you.
Comment January 5, 2005 by Jean-Marc Liotier
Thank you ! That is exactly the information I needed.
Comment January 9, 2005 by Steve
This was perfect, id tried other methods of making the auth. backward compatible which didnt help, this saved me MUCH time :)
Comment March 20, 2005 by anonymous
YOU ROCK! back up and working again....wheww...
Comment March 22, 2005 by anonymous
perferct dude this solved my 3 hours of headach
Comment April 11, 2005 by dem
Thank You Very Much! Saved me a million reboots!
Comment May 10, 2005 by madhu
In my.ini file in the mySQL directory (C:\Program Files\MySQL\MySQL Server 4.1\my.ini), add the following line after [mysqld] old_passwords
Comment May 16, 2005 by anonymous
Thanks! This worked: mysql> SET PASSWORD FOR 'some_user'@'some_host' = OLD_PASSWORD('newpwd');
Comment May 21, 2005 by Nick
Thanks heaps , I had been spending hours trying to find out why I couldn't authenticate.
Comment May 23, 2005 by anonymous
thanks! i wasted a good part of yesterday until i found this article.
Comment May 25, 2005 by anonymous
thanx a lot! took me a day. If only i found this site a day ago :)
Comment May 29, 2005 by anonymous
thanks dear,i solved my problem thru this soltion.
Comment June 16, 2005 by anonymous
This change should be indicated in big bold letters everywhere. Thanks!
Comment June 18, 2005 by anonymous
great! this was really helpful!
Comment June 24, 2005 by JShiva
Thank you
Comment June 26, 2005 by anonymous
After upgrade MySQL, just wondering why some websites can connect but other website cant connect. those both running on the same sever with the same mysql version.
Comment June 29, 2005 by anonymous
super *****
Comment July 5, 2005 by anonymous
you just make my day - thank you
Comment July 8, 2005 by new software intern
WOWWW!!! That was awesome instructions. I have spent a good 3 hours wondering what went wrong and reinstalling MySQL multiplt times. This is a great article
Comment July 18, 2005 by anonymous
Merci beaucoup! vous avez sauvez mon weekend !!!!
Comment August 7, 2005 by anonymous
These instructions helped me tremendously. So clear and to the point. You are bookmarked, my friend.
Comment August 9, 2005 by
yes, this helped alot. I used this syntax as well: use mysql; update user set password=old_password('password') where user='mysql@localhost'; flush privileges; And it accomplished the same thing
Comment August 11, 2005 by RP2005
Your GREAT that was cool.
Comment August 14, 2005 by anonymous
hey thankss !!! this solved my big problem... bijay :-)
Comment August 19, 2005 by MAMOUN
you saved my back from being kicked ;), from the buttom of my heart, THANK YOU !
Comment August 26, 2005 by Megan Allinson
thanks, this was great and it got me up and running very quickly! awesome :)
Comment August 29, 2005 by Ajay
that was a helpful hint in solving the problem...
Comment September 27, 2005 by Chandi
WOW!! you made my day... Thank you so much Chandi
Comment October 7, 2005 by Nitallica
Saved once again. Thank you! :)
Comment November 24, 2005 by Marvels
I have spent ages trying to find a solution to this problem. Thank you very much.
Comment December 30, 2005 by
Thankd dude!!! This wiorked in a flash! EBM
Comment February 7, 2006 by Thom
That's it. Thanks a very, very lot!
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WOW! I have been working on this problem for 3 days. I tried many other fixes to no avail, but this was sheer genius. I am up and running again. Woohoo!
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This is a very very very good sol.... i spent lot of time to find it out ---- you just save my time
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you simply rock my man!!!!
Comment March 23, 2006 by anonymous
mysql is running on windows 2003 and this solution doesn't work for me ! :(
Comment April 12, 2006 by anonymous
worked sweet for my guys.. update mysql.user set password = old_password(password); this sets all users passwords to the old password hash format. thanks
Comment April 16, 2006 by anonymous
senks !!!
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musim uznat, fakt po pici riesenie.
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Wounderful...simply wounderful
Comment May 30, 2006 by newbie kid.
I'm such a newbie, can you tell me step by step how to solve this problem? which program do I use to do all of this? thanks alot.
Comment July 22, 2006 by Dean Smith
Many Many thanks for publishing this fix
Comment July 31, 2006 by anonymous
cool you hot the right spot
Comment August 14, 2006 by anonymous
People have said and I'll say it again.. thanks a million, this saved and incredible amount of time and I hope it works for everyone else
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I thought I will need to uninstall mysql v5.0 and go back to the old version. But I'm so lucky that I found this article. Thank you very much!!!!
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You da man.
Comment September 11, 2006 by anonymous
Didn't work for me, i still get the same error but im looking into it
Comment October 1, 2006 by bolter99
Thanks a lot!
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Thanks you! your code is very useful & help me a lot ... thanks ya.....
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thanks. This article was really useful.
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Thanks so much! U save my few hours
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Great article! perfect solution to my problem! Thanks!
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It was taking me hours to fix this! I luvv you!
Comment January 9, 2007 by Elf
Beautiful, thankyou so, so much - I have spent hours on this...
Comment January 18, 2007 by Josh
Very nice. Worked like a charm.
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Perfect...thanks !
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Comment February 9, 2007 by chandu
GREAT JOB, Thank you
Comment February 26, 2007 by anonymous
Your solution gave me a solution right to the point! Thanks a lot !!!!!!!!!!!!!
Comment March 5, 2007 by anonymous
How do i do this in phpmyadmin. Where do i go to paste that query?
Comment March 20, 2007 by anonymous
server hosted mysql (godaddy) and phpmyadmin access no my.ini file. how would you update it
Comment March 20, 2007 by anonymous
yeah. it works GREAT. and for those who is still wondering, use the mysql command line client.. and type in the code. Nope, i dont think so u can do it thru phpmyadmin. gud luck. thanks a zillion anyways. imrnze
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3 years later and this article is still helping people... gotta love the internet
Comment June 12, 2007 by P.S.
Thanks a lot
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Thank you very much. It worked and solved my problem
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thanks very much sir, you have resolved my big issue,
Comment August 20, 2007 by Sam
Thanks, this really works......
Comment August 28, 2007 by Angus
along with half the planet - thanks v much :)
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it helped me too.. cooooooool
Comment October 15, 2007 by Pissed off
Trying to set up OSCOMMERCE software on GO DADDY server is worst then pulling teeth, I am using PHPMyAdmin that is provided by GD and pasting all this info that seems to work for you guys and Shit happens. When i go to the install page of OSCommerce still getting the same message : Client does not support authentication protocol requested by server; consider upgrading MySQL client If this was such a big fucking deal 2 years ago why are we still jumping through hoops 2 years later. I just want this crappy webpage to work. GD guy told me obout this still did nothhing,
Comment October 15, 2007 by sssssssss
SET PASSWORD = OLD_PASSWORD('TYPE_PASSWORD_HERE'); use this above line only for GoDaddy Server when using their phpMyAdmin curtesy of Doug
Comment October 17, 2007 by simmo
me too me too me too - this has been bugging me for days as I had to downgrade to php4/mysql4 from php5/mysql5 to have the same dev env as the customer's live env. Now it works again. Thank you
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Nice article.
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Thank You!
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That's perfect summary, very valuable for my next job of doing SEO friendly urls through htaccess. Thank you.
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wow...just great...i had installed mysql php etc. almost ten times but useless...done as u suggested and it is perfectly OK now...Thanks buddy. GOD with you.
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Thank you !!!
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Thank you !!!
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thanks Heaps.
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i have a problem to use my internet explora,when i try to open an page eg like google i get HTTP510 NOT IMPLIMENTED,ple i need help
Comment February 15, 2010 by Hiral Amodia
Absolutely a great article. Very useful indeed. Lots of thanks to the author and site.
Comment March 4, 2010 by Thanks
I have a PHP 5 with an old version of MySQL Server. But, I also have old PHP 4 servers looking at the same MySQL Server. The old works fine but the PHP 5 gives me the error. Can I use this and not mess up my PHP 4 boxes?
Comment March 25, 2010 by Pat Collins
You have saved me hours of frustration THANKS
Comment March 24, 2012 by
This article is STILL helping people in 2012! Thank you
Comment April 6, 2012 by Sindhuja
THANK YOU for the excellent article.